Storm Control

Storm control can prevent broadcast storms caused by broadcast, unknown multicast, or unknown unicast packets.

Context

Storm control is configured in the interface view to limit the number of packets per second.

In a detection interval, a device with storm control configured monitors the average rates of incoming packets on an interface and compares the average rates with the thresholds. When the rate of a particular type of packets exceeds the threshold allowed for these packets, the device performs storm control and takes a storm control action on the interface.

Storm control actions include Blocked and Shutdown. An interface that is blocked or shut down can be recovered in the following ways:

When the average rates of incoming packets on a blocked interface fall below the lower thresholds, the interface is unblocked to forward packets.
If the action is Shutdown, you need to manually unblock the interface or enable the interface to automatically recover to the Up state.

Procedure

Configure storm control.

Choose Security > Storm Control > Storm Control in the navigation tree to open the Storm Control page

Select an interface and click Configure to open the Storm Control page

Table 1 describes the parameters on the page.

**Table 1** Storm Control
Parameter		Description
Interface name		Indicates the interface where storm control is configured.
Action		Indicates the storm control action, including interface shutdown and packet blocking.
Status		Indicates the type of packets for which storm control is configured, including unicast, multicast, and broadcast packets.
Height threshold		Indicates the upper threshold of packet rate, in pps. This parameter is valid only when storm control is enabled.
Low threshold		Indicates the lower threshold of packet rate, in pps. This parameter is valid only when storm control is enabled.

Set the required parameters.
Click OK to complete the configuration.

Query storm control information.
1. Choose Security > Storm Control > Storm Control in the navigation tree to open the Storm Control page.
2. In the Query area, select an interface type and enter the interface number, and click Query.